Concentrator



(No Model.) 3 Sheets-Sheet 1.

G. R. MUMMA.

. OONGENTRATOR.

No. 539,879. Patented May 28 1895.

INVENTOR Cf? MUMMH.

ATTORNEY m: Nonn s warms co, mofo u'mou WASHINGTON. n. c.

(No Model.) 3 Sheets-Sheet 2.

O.- R. MUMMA. GONGENTRATOR.

No. 539,879. Patented May 28, 1895.

I l l E 25 3 6136. i gill INVENTOR C. H. MUM/4R ATTORNEY YNE wonms wnzasco, vuorau'rno WASNDNGYON, n. c,

(No Model.) 3 Sheets-Sheet 3.

G. R. MUMMA.

00NGENTRATOR. No. 539,879. Patented May 28, 1895.

IN VENTOR UNrTED STATES PATENT OFFICE.

CHARLES R. MUMMA, OF DENVER, COLORADO.

CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 539,879, dated. May 28,1895.

Application filed July 28, 1894.

To all whom it may concern.-

Be it known that I, CHARLES R. MUMMA, a citizen of the United States ofAmerica, residing at Denver, in the county of Arapahoe and State ofColorado, have inventedcertain new and useful Improvements inConcentrators; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had'to the accompanying drawings, and to the figures of referencemarked thereon, which form a part of this specification.

My invention relates to improvements in concentrators, speciallydesigned for treating placer material or dirt containing free gold.

The machine may be used with or without' being partly broken away. Fig.6is a rear partly in section.

end view of the machine, the hopper being shown in section. Fig. 4 is aside elevation, Fig. 5 is an enlarged top or plan view, in detail, ofthe concentrating- .table, the top plates'being partly broken away. Afragment of the chute leading from the hopper is shown in this view.Figs. 6, 7, and 8 are sections taken on the lines w w, y y, and z .2,respectively, Fig. 5. Fig. 9 isa section taken on the line '0 12, Fig.5. Figs. 10 and 11 illustrate the manner of connecting the two sets ofplates on the concentratingtable, the flanges of the plates 5 beingomitted. Fig. 12 is a fragmentary perspective view of the plate 5showing its flange.

Similar reference characters indicating corresponding parts in theseviews, let the numeral 6 designate the stationary framework composed ofthe horizontal base bars, the inmounted in this framework is theinclined concentrating table 5 which is supported by Serial No. 518,843.(No model.)

rods 7 having rounded ends engaging sockets 8 attached to the frame andtable, whereby the latter is permitted to move both longiv tudinally andlaterally. The table has a longitudinal movement imparted by a pitman 9connected with a crank 1O formed on the shaft 10 journaled in theframework. The pitman is suitably attached to the upper extremity of thetable at a central point.

Motion is transmitted to the shaft 10 from a short shaft 12 providedwith a gear 13 meshing with a pinion 14 fast on the shaft 10. The shaft12 is journaled in the framework, and the gear 13 is provided with ahand crank 13 though the machine may be propelled in any other suitablemanner. The lateral moveme'ntis also communicated from the shaft 10through the agency of a pitman 15,- two bell crank levers 16 and 17, anda connecting rod,

19. The pitman is connected at one extremity with a wrist pin formedoutside the1oenter of a disk 18 made fast on the shaft 10;

while the opposite extremity is pivotally attached to the connecting rod19 at a point 20.

The connecting rod is pivoted to one arm of each bell crank lever, theother arm of each lever being connected with a metal strap 21 made fastto the bottom of the table. The arm connected with the strap 21 ispreferably somewhat shorter in the lever 17 than in the lever 16,whereby the lateral movement of the upper extremity of the table issomewhat greater than the corresponding movement of its lower extremity.

-The body of the table is preferably composed of wood, the upper surfaceof its bottom being provided with a covering 5" of some suitable sheetmetal, as galvanized iron. About one half of this sheet metal bottom, asshown in the drawings, is provided with short pins 5 projecting upwardlytherefrom. This pin-covered portion of the bottom is widest at the upperextremity of the table and diminishes gradually in Width toward thelower extremity. (See Fig. '5.) On either side of the pin-coveredportion of the bottom, are arranged plates 5 which are soldered orotherwise suitably fastened to the bottom 5 at the edges, designated bythe lines 5 From the edges 5 which engage the bottom 5 these plates 5are upwardly inclined, whereby their edges 5 are considerably raisedfrom the bottom of the table. In describing the plates 5, their extentcrosswise or transversely of the table will be termed their length;while their extent on a line at right angles to their length will betermed their width. The uppermost plates 5 are shortest; and theyincrease in length from the upper part of the table toward its lowerextremity where they are longest. The inner extremities of the plates 5are provided with depending supporting flanges 5 which engage the bottom5. These flanges also extend upwardly above the plate, and rearwardlytherefrom, separating the plain part 5 of the bottom of the table fromthe pin-covered curved part 5. The edge 5 or the raised edge of eachplate 5 is engaged by a top plate 25 which extends transversely of thetable, and entirely crosses the same. The ends of these top plates restupon cleats 26, while they are centrally supported by the pins 5, whosetops they engage. The edges of the plates 25 nearer the upper extremityof the tablevmay butt against the edges of the plates 5, or extendslightly under the same as may be desired, since the gangue from theplates 5 must pass to the plates 25. The ends of the last named platesare provided with upwardly extending flanges apertured to receivefastening screws which enter the vertical sides of the table.

The table is provided at its lower extremity with an opening 27 in thebottom, communicating with a conduit 28 leading to a receptacle 29.Below the opening 27, the bottom of the box is provided with atransverse riffle 30t The machine is provided at its head end or upperextremity with a movable feed hopper 31 having a double, transverselyinclined screen 32 whose lower extremity communicates with an outlet33in one side of the hopper, from which leads a short chute 34 throughwhich the coarser portion of the gangue is carried from the machine. Thebottom of the hopper is provided with an outlet controlled by a gate orvalve 36.

To the lower part of the hopper is attached a chute 37 whose bottom iscovered with pins 5 of the same character as those carried by the table5. Above the pins, and engaging their tops, is located a plate 38 whichforms the top of the chute which is closed thereby. The chute isproperly inclined, and its bottom 37 is covered by a plate 39 to whichthe pins 5 are attached. The lower extremity of this plate leads to thebottom 5 of the table 5.

To the bottom of the hopper, and extending upwardly and rearwardlytherefrom, is made fast an arm 40 pivotally connectedat its upperextremity as shown at etl with a stationary projection 42 made fast tothe framework at its lower extremity.

The lower extremity of the chute is supported by a rod 7 whoseextremities engage sockets 8 attached respectively to the framework andthe bottom chute.

The bell crank lever 16, heretofore described,is provided with anauxiliary arm 16 which is pivotally connected with a metal strap 21secured to the under surface of the chutes bottom, whereby anoscillating movement is imparted to the hopper and chute by virtue ofthe pivotal connection ll.

The operation of the machine may be described as follows: Assuming thatthe machine is set in motion by turning the gear 13, the material to betreated is discharged into the hopper 31. The coarser portion of thegangue is rejected by the screen 32 and thrown from the machine; whilethe finer part ofthe material passes through the hopper outlet to thechute 37, and thence to the table 5. Through the movement of the chuteand table, and through the agency. of the pins 5, the material iscontinually agitated, whereby the settling of the values therein isfacilitated; While after reaching the table it is subjected to amovement similar to that empioyed in hand-panning, this movement beingresultant of the longitudinal and lateral movements imparted to thetable, and heretofore described. As the material leaves the chute, thelighter and coarser gangue, which is uppermost in the bottomthere0f,'passes to the first plate 25 of the table; while the heaviergangue beneath, together with the mineral which has settledto'engagement with the plate 39, passes to the plate 5 on the bottom 1of the table.

tinued on the table, and as the gangue rises The separation is furtherconto the top, and the mineral settles, the gangue passes over theflanges 5 to the plates 5 and thence to the next plate 25; and so on,this method of separation being continued until the mineral orconcentrates are discharged through the opening 27 in the bottom of thetable, and pass thence through the conduit 28 to the receptacle 29.

It must be understood that this machine may be used with or withoutwater. If water is employed to facilitate the separation of the mineralfrom the gangue, the pins 5, hereinbefore described, are used. If,however, it is desired to use the machine without water, whereby itbecomes a dry placer machine, the pins 5 are preferably omitted.

In addition to the mechanism heretofore described, a shaft 50isjournaled in the frame work 6 and carries a fly Wheel 51 at oneextremity, and a pinion 52 at the opposite extremity. The pinion mesheswith the crank wheel 13.

Having thus described my invention, what I claim is- I. In aconcentrator, the combination with a suitable stationary framework, ofthe table movably mounted therein and provided with a series of platesinclined to the plane of the table, and arranged on both sides of thecen tral part of the tables bottom, said plates being provided withflanges 5 which extend both above and below the plates, substantially asdescribed.

2. In a concentrator, the combination with a suitable stationaryframework, of the table movably mounted thereon and provided with "videdwith pins, substantially as described.

3. In a concentrator, the combination with a suitable stationaryframework, of a table movably mounted thereon and provided with a seriesof inclined plates placed at intervals on both sides of the central partof the table, said plates having vertical flanges which extend bothabove and below the plates, and to the rear thereof, said plates beingshortest at the head of the table and increasing in length toward thefoot or tail thereof, substantially as described.

4:. In a concentrator, the combination with a suitable stationaryframework, of atable movably mounted thereon and provided with a seriesofinclined plates arranged on either side of the central part of thetable and provided with flanges which extend above, below and to therear of the plates, and other top plates extending transversely of thetable, covering its central part, and so located as to receive thedischarge from the first named series of plates, substantially asdescribed.

5. In a concentrator, the combination with a suitable stationaryframework, of the table movably mounted thereon and provided with aseries of inclined plates arranged on both sides of the central part ofthe tables bottom, said plates being provided with flanges 5 whichextend above, below and to the rear of the plates, other platesextending transversely of the table, covering its central part and solocated as to receive the discharge from the first named series ofplates, and a movable hopper also mounted on the framework and providedwith a chute adapted to deliver the material to be treated to the table,substantially as described.

6. In a concentrator, the combination with a suitable stationaryframework, of the table movably mounted thereon and provided with aseries of plates inclined to the plane of the table, and arranged onboth sides of the central part of the tables bottom, said plates beingprovided with flanges 5 which extend above, below and to the rear of theplates, a hopper also movably mounted on the framework, and providedwith a chute adapted to deliver to the table, the material to betreated, and suitable means for simultaneously imparting to the tableand hopper, the requisite Witnesses: V

BRINTON GREGORY, OHAs. E. DAWSON.

